1 files changed, 139 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Hes_Cpu.h b/plugins/gme/game-music-emu-0.6pre/gme/Hes_Cpu.h
new file mode 100644
index 00000000..b71cbc64
--- /dev/null
+++ b/plugins/gme/game-music-emu-0.6pre/gme/Hes_Cpu.h
@@ -0,0 +1,139 @@
+// PC Engine CPU emulator for use with HES music files
+
+// Game_Music_Emu 0.6-pre
+#ifndef HES_CPU_H
+#define HES_CPU_H
+
+#include "blargg_common.h"
+
+class Hes_Cpu {
+public:
+	typedef BOOST::uint8_t byte;
+	typedef int time_t;
+	typedef int addr_t;
+	enum { future_time = INT_MAX/2 + 1 };
+	
+	void reset();
+	
+	enum { page_bits = 13 };
+	enum { page_size = 1 << page_bits };
+	enum { page_count = 0x10000 / page_size };
+	void set_mmr( int reg, int bank, void const* code );
+	
+	byte const* get_code( addr_t );
+	
+	// NOT kept updated during emulation.
+	struct registers_t {
+		BOOST::uint16_t pc;
+		byte a;
+		byte x;
+		byte y;
+		byte flags;
+		byte sp;
+	};
+	registers_t r;
+	
+	// page mapping registers
+	byte mmr [page_count + 1];
+	
+	// Time of beginning of next instruction to be executed
+	time_t time() const             { return cpu_state->time + cpu_state->base; }
+	void set_time( time_t t )       { cpu_state->time = t - cpu_state->base; }
+	void adjust_time( int delta )   { cpu_state->time += delta; }
+	
+	// Clocks past end (negative if before)
+	int time_past_end() const           { return cpu_state->time; }
+	
+	// Time of next IRQ
+	time_t irq_time() const         { return irq_time_; }
+	void set_irq_time( time_t );
+	
+	// Emulation stops once time >= end_time
+	time_t end_time() const         { return end_time_; }
+	void set_end_time( time_t );
+	
+	// Subtracts t from all times
+	void end_frame( time_t t );
+	
+	// Can read this many bytes past end of a page
+	enum { cpu_padding = 8 };
+	
+private:
+	// noncopyable
+	Hes_Cpu( const Hes_Cpu& );
+	Hes_Cpu& operator = ( const Hes_Cpu& );
+
+
+// Implementation
+public:
+	Hes_Cpu() { cpu_state = &cpu_state_; }
+	enum { irq_inhibit_mask = 0x04 };
+
+	struct cpu_state_t {
+		byte const* code_map [page_count + 1];
+		time_t base;
+		int time;
+	};
+	cpu_state_t* cpu_state; // points to cpu_state_ or a local copy
+	cpu_state_t cpu_state_;
+	time_t irq_time_;
+	time_t end_time_;
+	
+private:
+	void set_code_page( int, void const* );
+	inline void update_end_time( time_t end, time_t irq );
+};
+
+#define HES_CPU_PAGE( addr ) ((unsigned) (addr) >> Hes_Cpu::page_bits)
+
+#if BLARGG_NONPORTABLE
+	#define HES_CPU_OFFSET( addr ) (addr)
+#else
+	#define HES_CPU_OFFSET( addr ) ((addr) & (Hes_Cpu::page_size - 1))
+#endif
+
+inline BOOST::uint8_t const* Hes_Cpu::get_code( addr_t addr )
+{
+	return cpu_state_.code_map [HES_CPU_PAGE( addr )] + HES_CPU_OFFSET( addr );
+}
+
+inline void Hes_Cpu::update_end_time( time_t end, time_t irq )
+{
+	if ( end > irq && !(r.flags & irq_inhibit_mask) )
+		end = irq;
+	
+	cpu_state->time += cpu_state->base - end;
+	cpu_state->base = end;
+}
+
+inline void Hes_Cpu::set_irq_time( time_t t )
+{
+	irq_time_ = t;
+	update_end_time( end_time_, t );
+}
+
+inline void Hes_Cpu::set_end_time( time_t t )
+{
+	end_time_ = t;
+	update_end_time( t, irq_time_ );
+}
+
+inline void Hes_Cpu::end_frame( time_t t )
+{
+	assert( cpu_state == &cpu_state_ );
+	cpu_state_.base -= t;
+	if ( irq_time_ < future_time ) irq_time_ -= t;
+	if ( end_time_ < future_time ) end_time_ -= t;
+}
+
+inline void Hes_Cpu::set_mmr( int reg, int bank, void const* code )
+{
+	assert( (unsigned) reg <= page_count ); // allow page past end to be set
+	assert( (unsigned) bank < 0x100 );
+	mmr [reg] = bank;
+	byte const* p = STATIC_CAST(byte const*,code) - HES_CPU_OFFSET( reg << page_bits );
+	cpu_state->code_map [reg] = p;
+	cpu_state_.code_map [reg] = p;
+}
+
+#endif